These will fit 4 standard AK magazines, 4 Magpul-type AR magazines, or smaller. 
 
MOLLE webbing
Hook-and-loop closure
Padded partitions inside
Drainage holes at the bottom
Material: 100% polyester, polyvinyl chloride-coated
Dimensions: 15x19x7cm (6"x7.5"x2.7")
Weight: 230g
Manufacturer: Mil-Tec